Hydraulic valve.



No. 659.03I. Patented (Ict. 2, |900. ,H. W.K|MS.' A

A HYDRAULIG VALVE.

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Patented 0st. 2, |900. H. w. KIM-Es. l HYDRAULIC VALVE. (Appncaeioxbd sept. 25, 1699:)

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No. 659,-03L` y Patented 001:; 2, |900.

H. W. KIMES.

HYnRAuLlc vALvL applicati@ mea spt. 25,'1899.)

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'STATES PATENT `i Frise.

HUGH W. KIMES, OF DAYTON, OHIO, ASSIGNOR TO THE STlLWELL-BIEROE da SMlTH-VAILE COMPANY, OF `SAME PLACE.

HYDRAULICVALVE.

SPECIFICATION forming part of Letters Patent o. 659,031, datd October 2, 1900. Application filed September 25, 1899. serial No. 7 31,670. (No model.) v

To @ZZ whom t may concern,.- freference being made to the accompanying Be it known that l, HUGH W. KIMES, a citi-l drawings, of which-l zen of the United States, residing at Dayton, Figure 1 is an end elevation of the hydraulic in the county of Montgomery and State of `valve hereinafter described. Fig. 2 is a ver- 5 Ohio, .have invented certain new and useful tical section thereof on the line of Fig. 1; 55 Improvements in Hydraulic Valves; and I do Fig. 3, an elevation of the highpressure valve declare the following to be a full, clear, and yand a portion of the surrounding case in secexact description of the invention,'such'as tion; Figl, an elevation and end view, rewill enable others skilled in the art to which spectively, of the choker or throttling de- Io it appertains to make and use the sa/rne, refvice; and Fig'. 5,a vertical section on the line 6o erence'being had to the accompanyingdraw- Qc x of Fig. 2. ings, and to the letters of reference marked Describing the valvein detail, A designates thereon, which form a part of this speciflcathe body or casing, which is bored substantion. ftially as shown in Fig. 2 and has a coupling- This invention relates to improvements in socket B for the pipe leading from the low- 65 valves for controlling hydraulic presses. pressure pump.V

In a broad sense the object of the invention B is a coupling-socket for the pipe leading is to provide a valve which will be free from lfrom the high-pressure pump. the defects which are known to exist -to a Bl is acoupling for the connection of the zo greater or less extent in the valves now avail- :pipe Athrough which the automatic or high- Y 7o able for hydraulic presses. These valves in pressure valve is actuated, and B8 is a coupmany instances are used in connection with lling-socket forconnecting the discharge-pipe; cotton-seed-oil presses, which are usually un- B4, a coupling for connection with the press. der the control of unskilled labor. Therefore O designates a double-seating manuallymore or less trouble is the result, and experioperative valve which cooperates with the 75 ence has taught the builders of machineryof valve-plug C in controlling the communicathis character the necessity of constructing-a 'tionof the press-passage D' with the main valve which is simple, positive, efficient, and high and low pressure passage D'. The latter lasting under the most unfavorable condipassage is common to both low and high prestions. In the detailed descriptionV to follow sure valves. The low-pressure valve serves 8o mention will be made of the valve in connecto admit pressure to move the raml and aption with oil-presses; but it will be borne in ply the initial pressure lo the article to be mind that the said valve may be employed to compressed and the high-pressure valve servdrive a hydraulic ram or plunger by means ing to apply suitable pressure to complete the of Huid-pressure wherever an augmenting or operation of squeezing or compressing said 85 increasing pressure is called for. article. The casing A-is also provided with The main feature of the invention consists a suitable cavity to receive the valve C and in combining an automatic high pressure adjuncts, the adjuncts consisting of a screw- Valve and a low-pressure valve in such rela.- plug E and ring E', said ring forming the up- 4o tion that the said high-pressure valve is es- `per seat for the valve O. The lower side of 9o sentially and indirectly under control of the the ring E has an annular recess, which relow pressure valve for a certain period ceives a packing-ring E", that seals the valvethrough the medium of the press-cylinder, chamber a. A packing-ring a' forms a seal during which time said high-pressure valve between said ring and the plug E. The seat is operated automatically by the pressure or ring El has a peripheral groove b, from 95 from the press cylinder to simultaneously which a series of ports c extend inwardly and close the low-pressure valve and admit iiuid communicate with the exhaust-chamber a. from the high-pressure pump or other source ll The dotted circle ldindicates the pipe-opento the press-cylinder, as will be more particuing communicating with the groove b, be-

5o larly described in the following speciiication, tween which and the press-passages D comloo munication is established by the valve C when moved from the seat E.

Owing to the construction of the ring or seat E, as above described, it may be placed in position without any prearrangement thereof, a communication being always established between the groove b and the exhaust-chamber a through one or more of the ports c. The valve Cseats on the valve-plug G when establishing communication between the press-passage D' and the exhaust-chamber a. A piston-valve F controls the duct or passage F. Liquid entering said passage from the source of low-pressure supply raises said valve and passes into the main passage D, and, raising the Valve-plug C', discharges into the press-passages D. The hydraulic ram is thus quickly raised by this pressure to a predetermined point to suit the conditions of the work. At this moment highpressure fluid is admitted through valve H on the lower end of a differential plunger. As shown in the drawings, this plunger is reduced at the valve end to provide a chamber I, which is fed by the high-pressure pump. There is also a suitable chamber I above the upper end of the plunger, which communicates with the lower chamber I through a channel I, formed in the plunger and appearingin broken lines throughout the length thereof. The fluid-pressure entering chamber I passes through the channel I to the upper chamber I and, filling said chamber, exerts pressure on the top of the plungerstem, which is sufficient to normally maintain the valve H on its seat J, thereby controlling the high-pressure passages D and D3 during the supremacy of the pressure in chamberl'. The middle portion of the plunger is considerably increased in diameter by providing it with a piston L, below which is placed a screw-plug L. ring L" is placed between the piston and said screw-plug to seal the chamber M below said piston. This chamber isof suitable depth to allow the piston proper movement to raise the valve Hfrom its seat. It will also be observed that the diameter of said chamber is something over twice that of the upper chamber I', so that the pressure under the piston will exceed that on the top of the stem at a predetermined timef/ The chamber M is in communication with the press-cylinder by means of a pipe connected through coupling-socket B". The upper end of the plunger is inelosed by inner and outer screwplugs N and N'and is surrounded by a lower screw-plug N, which serve to hold the packing-crimps O O in position. These packingcrimps seal the upper and lower chambers from the central chamber M.

P designates a choker for reducing the volume and controlling the flow from the highpressure pump. The engaging end thereof is cone-shaped and seats againsta bushing or seat P. This device reduces the passage from thehighpressure passage D to the main pas- A crimp or packing sage D by means of a slit f, cut in the coneshaped end and constituting a narrow passage to the main passage D. Il will be understood that the high-pressure passage through Valve H to the chamber D is larger than the openingfin the end of the choker. Therefore high pressure will rapidly accumulate in the passage D" and enter the passage D3. This choker is inclosed by a screw-plug P and packing-crimp P3. It may be withdrawn from its seat whenever it becomes necessary to cleanse the several passages, which may be done by flushing them with liquid through the high-pressure valve.

The operation of the valve is briefly described as follows: Fluid entering from the source of low-pressure supply lifts the pistonvalve F, passes into the main passage D, and lifts the valve-plug C. This takes place when the valve O is moved away| from the valve-plug C', as shown in Fig. 2. The pressure passes through said valve-plug and enters the press-passage D to the press-cylin- IOO mitted through said valve to the passage D3 rushes into chamber D4 above the low-pressure piston-valve F. This pressure exceeding that below the said valve the latter is thereby closed, and the inflow of Huid from the low-pressure pump is cut off. The highpressure fluid alone enters the press-cylinder at this point, exerting the requisite pressure upon the ram to give the material the necessary compression and com plete the operation.

Having fully described my invention, I claiml. In a valve for controllinghydraulic pressure, the combination with low and high pressure valves, of a main passage communicating with both of said valves, a reduced passage between said high-pressure valve and said main passage, a passage forming a communication between said reduced passage and the low-pressure valve, a communication between the press-cylinder and the high-pressure valve, whereby said high-pressure valve is opened by pressure obtained indirectly through the low-pressure valve, and means located in the main passage for throttling the passage of pressure from the high-pressure valve to said main passage whereby the initial pressure from the high-pressure valve is directed to the low-pressure valve to instantaneously close said low-pressure valve upon the opening of said high-pressure valve, substantially as specified.

2. In a valve mechanism for hydraulic rams, the combination of alow and a high pressure IIO Valve, a main passage common to both of said Valves, a check-valve intercepting the communications between said main passage and the passage leading to the press-cylinder, a communication between said press-cylinder and the high-pressure valve whereby said high-pressure valve is opened when the pressure in the press-cylinder reaches a predetermined stage, a reduced passage forming a communication between high-pressure valve and said main passage, adirect passage forming a communication between the said reduced passage and the low-pressure valve, and a throttling device for retarding the communication between said reduced passage and the main passage whereby the pressure from the high-pressure valve is enabled to have an effect upon the low-pressu re valve to close the same instantaneously with the openingof the high-pressure valve,s ubstantially as specified. 3. In a valve mechanism for hydraulic rams, the combination with low and high pressure valves, of a main passage communicated with by both of said valves, a check-Valve interposed between said main passage and the passage leading to the press-cylinder,a communication between said press-cylinder and the high-pressure valve, whereby said high-pressure valve is opened when the pressurev in said press-cylinder attains a predetermined stage, a passage D forming a direct communication between said high -pressure Valve and said main passage, a passage forming a direct communication between said passage D" and the low-pressure valve, and a throttling device interposed in said main passage between said passage D" and the low-pressure valve, whereby an accumulation of high pressure between said low-pressure valve and throttling deviceVis prevented, and the high pressure is enabled to act upon the low-pressure valve instantaneously with the passage of pressure from the high-pressure valve to the passage D", substantially as described.

4. In a valve mechanism for hydraulic rams, the combination with low and high pressure valves, of a main passage communicated with by both of said valves, a check-valve interposed between said main passage and the pas- 5o sage leading to the press-cylinder,a manuallypassage between said passage D" and the lowpressure Valve whereby an accumulation of high pressure between said low pressure Valve and throttling device is prevented and the high-pressure valve is enabled lto act upon the low-pressure valve instantaneously with the passage of pressure from the high-pressure valve to the said passage D", substantially as described.

5. In a valve mechanism for hydraulic rams, the combination of low and high pressure passages, a main passage common to both of said passages and communicating with apassage leading to the press-cylinder, means for reducing the volume and for controlling the iiow of Yhigh pressure to said main passage, the said means being located within said main passage between the high and low pressure valves, a check-valve for controlling the passage of pressure from said main passage to the passage leading to the press-cylinder, a differential valve or plunger controlling the high-pressure passage communicating with -the main passage, and a direct passage forming a communication between the high-pressure valve and the low-pressure valve whereby the initial pressure admitted through said high-pressure valve will have the effect of instantan eously closing said low-pressure valve upon the admission of pressure through the high-pressure valve, substantially as speciied.

In testimony whereof I aftix my signature in presence of two witnesses.

HUGH W. KIMES. 

